November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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62
4
章 折れ線グラフ
図4-3 yの範囲を手動で設定した折れ線グラフ
関連項目
軸の範囲を変更する方法についてより詳しくは、「レシピ8.2 連続値の軸の範囲を設定する」を参照
してください。
レシピ
4.2
折れ線グラフに点を追加する
問題
折れ線グラフに点を追加したい。
解決策
geom_point()
を追加します（図 4-4）。
ggplot(BOD, aes(x = Time, y = demand)) +
geom_line() +
geom_point()
レシピ
4.2
折れ線グラフに点を追加する
63
図4-4 点を追加した折れ線グラフ
解説
折れ線グラフ上にデータポイントを表示するとわかりやすい場合があります。観測データの数が密で
ない場合や、観測データの間隔が一定でない場合などに、点の位置を示すとグラフがより見やすくな
ります。例えば、
BOD
データセットでは
Time=6
に対応するエントリは存在しませんが、点がない線のみ
のグラフではそれを明示できません（図4-3と図4-4を比べてみてください）。
worldpop
データセットでは、データポイント間の間隔が一定ではありません。大昔の推定値は、近
代ほどの頻度では取られていないからです。グラフ上に表示された点は、推定値が算出された点を示
しています（図4-5 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.